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Choosing a Double Glazed Window Handle The right double glazed window handle will keep your windows secure and energy efficient. You can install new handles or replace the old handles on your window. There are many types of handles. One of them is the cockspur handle, which is a spur that snaps on to the striker in the shape of a wedge. In-line UPVC handles are straight and can be turned left or right, while cranked ones come in left and right variations. These handles are designed to work with multipoint lo